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can someone help me solving this question? 

 

A random variable X is normally distributed with μ =150 and σ =10 .
 
Find the interquartile range of X .

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can someone help me solving this question? 

 

A random variable X is normally distributed with μ =150 and σ =10 .
 
Find the interquartile range of X .

 

 

Aha! I came across this one a short while ago. 

 

Use your GDC! Use the normal distribution function  (InvN where Q1 probability = 0.75 with the RIGHT tail, and Q3 probability = 0.75 with the LEFT tail) and just subtract the value for Q3 - the value for Q1.) 

 

Good luck! 

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